DS24B33 1-Wire 4Kb EEPROM General Description Features The DS24B33 is a 4096-bit, 1-Wire EEPROM orga- 4096 Bits of Nonvolatile EEPROM Partitioned Into nized as 16 memory pages of 256 bits each. Data is Sixteen 256-Bit Pages written to a 32-byte scratchpad, verified, and then Read and Write Access is Highly Backward- copied to the EEPROM memory. The DS24B33 commu- Compatible to the DS2433 nicates over a single-conductor 1-Wire bus. The com- munication follows the standard 1-Wire protocol. Each 256-Bit Scratchpad with Strict Read/Write device has its own unalterable and unique 64-bit regis- Protocols Ensures Integrity of Data Transfer tration number that is factory programmed into the chip. Unique, Factory-Programmed, 64-Bit Registration The registration number is used to address the device in a multidrop 1-Wire net environment. The DS24B33 is Number Ensures Error-Free Device Selection and software compatible to the DS2433. Absolute Part Identity Switchpoint Hysteresis to Optimize Performance Applications in the Presence of Noise Storage of Calibration Constants Communicates to Host at 15.4kbps or 125kbps Board Identification Using 1-Wire Protocol Storage of Product Revision Status Low-Cost Through-Hole and SMD Packages Operating Range: +2.8V to +5.25V, -40C to +85C Typical Operating Circuit IEC 1000-4-2 Level 4 ESD Protection (8kV Contact, 15kV Air, Typical) for IO Pin V CC R PUP Ordering Information IO PART TEMP RANGE PIN-PACKAGE DS24B33+ -40C to +85C TO-92 DS24B33 C DS24B33+T&R -40C to +85C TO-92 Functional Diagrams DS24B33G+T&R -40C to +85C 2 SFN (2.5k pcs) GND DS24B33Q+T&R -40C to +85C 6 TDFN-EP* (2.5k pcs) DS24B33S+ -40C to +85C 8 SO (208 mils) DS24B33S+T&R -40C to +85C 8 SO (208 mils) Note: The leads of TO-92 packages on tape and reel are formed to approximately 100-mil (2.54mm) spacing. For details, refer to the package outline drawing. +Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel. *EP = Exposed pad. Pin Configurations appear at end of data sheet. Functional Diagrams continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. 1-Wire is a registered trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct 19-5759 Rev 3 5/12 at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. AVAILABLEDS24B33 1-Wire 4Kb EEPROM ABSOLUTE MAXIMUM RATINGS IO Voltage Range to GND........................................-0.5V to +6V Lead Temperature (soldering, 10s) .................................+300C IO Sink Current....................................................................20mA Soldering Temperature (reflow) Operating Temperature Range ...........................-40C to +85C TO-92 ...........................................................................+250C Junction Temperature......................................................+150C All other packages, excluding SFN .............................+260C Storage Temperature Range .............................-55C to +125C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (T = -40C to +85C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS IO PIN: GENERAL DATA 1-Wire Pullup Voltage V (Notes 2, 3) 2.8 5.25 V PUP 1-Wire Pullup Resistance R (Notes 2, 4) 0.3 2.2 k PUP Input Capacitance C (Notes 5, 6) 2000 pF IO Input Load Current I IO at V 0.05 5 A L PUPMAX V - PUP High-to-Low Switching Threshold V (Notes 6, 7, 8) 0.5 V TL 1.8 Input Low Voltage V (Notes 2, 9) 0.5 V IL V - PUP Low-to-High Switching Threshold V (Notes 6, 7, 10) 1.0 V TH 1.0 Switching Hysteresis V (Notes 6, 7, 11) 0.2 1.7 V HY Output Low Voltage V At 4mA (Note 12) 0.4 V OL Standard speed 5 Overdrive speed 2 Recovery Time t V +4.5V 1 s REC PUP (Notes 2, 13) Directly prior to reset pulse 640s 5 Directly prior to reset pulse > 640s 10 Standard speed 65 Standard speed, V +4.5V 61 Time-Slot Duration PUP t s SLOT (Notes 2, 14) Overdrive speed 8 Overdrive speed, V +4.5V 7 PUP IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE Standard speed, t before reset = 10s 480 960 REC Reset Low Time t s RSTL Standard speed, t before reset = 5s 480 640 REC (Note 2) Overdrive speed 48 80 Standard speed 15 60 Presence-Detect High Time t s PDH Overdrive speed 2 6 Standard speed 60 240 Presence-Detect Low Time t s PDL Overdrive speed 8 24 Standard speed 60 75 Presence-Detect Sample Time t s MSP (Notes 2, 15) Overdrive speed 6 10 2 Maxim Integrated